<template>
    <div class="app-container">

        <!-- 顶部 Header 区域 -->
        <mt-header fixed title="黑马程序员·Vue项目">
			<span slot="left" @click="goBack" v-show="flag">
				<mt-button icon="back">返回</mt-button>
			</span>
		</mt-header>


        <!-- 中间的路由 router-view 区域 -->
		<transition>
			<router-view></router-view>
		</transition>

        <!-- 底部 Tabbar 区域 en-->
        <nav class="mui-bar mui-bar-tab">
			<router-link class="mui-tab-item-hyt" to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="mui-tab-item-hyt" to="/member">
				<span class="mui-icon mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="mui-tab-item-hyt" to="/shopcar">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart">
					<span class="mui-badge" id="badge">{{ $store.getters.getAllCount }}</span>
				</span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="mui-tab-item-hyt" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>

    </div>
</template>

<script>
export default{
	data() {
		return {
			flag:false
		}
	},
	created() {
		this.flag = this.$route.path === "/home" ? false : true;	//三元表达式
	},
	methods: {
		goBack(){	//点击后退
			this.$router.go(-1);
		}	
	},
	watch: {
		'$route.path':function(newVal) {
			if (newVal === "/home") {
				this.flag = false
			}else{
				this.flag = true
			}
		}
	}
}
</script>

<style lang="scss" scoped>
.mint-header{
	z-index:99;
}

.app-container{
    padding-top: 40px;
	padding-bottom:50px;
	overflow-x:hidden;			//将换页面那一瞬间的滚动条消失，以及header和tabbar固定住（就是让宽度只显示当前屏幕的，而不是当前屏幕和下一个页面 两个页面的宽度一起显示）
}

.v-enter{
	opacity:0;
	transform:translateX(100%);		//设置屏幕的宽度为100%		屏幕<--下一个页面
}
.v-leave-to{
	opacity:0;
	transform:translateX(-100%);	//						   划过的那个页面<--屏幕
	position:absolute;				//避免换页面的时候,进入的页面出现在当前的页面下面
}

.v-enter-active,
.v-leave-active{
	transition:all 0.5s ease;  
}


//改类名mui-tab-item-hyt ，解决 tabbar 点击无法切换的问题   (以下四套样式)

.mui-bar-tab .mui-tab-item-hyt.mui-active {
    color: #007aff;
}

.mui-bar-tab .mui-tab-item-hyt {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
}

.mui-bar-tab .mui-tab-item-hyt .mui-icon{
	top: 3px;
	width: 24px;
	height: 24px;
	padding-top: 0;
	padding-bottom: 0;
}

.mui-bar-tab .mui-tab-item-hyt .mui-icon~.mui-tab-label{
	font-size: 11px;
	display: block;
	overflow: hidden;
	text-overflow: ellipsis;
}
</style>